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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbb79e0fc35542a89ffb9be04ed78a5075e9d58e2c2b3276bb9e9ce6af088c7' 
  AND token = '6T55VZ/Vq8X0aBsECQ9n7oycP/9/R5NbIr7wE4wQOXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}