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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5554d2c0dfd607497da68ed0ec7ab2bdd2b98c93af6361bade40078436fb16c3' 
  AND token = 'rM2o3Yoz7wZIv5oFogDlt45TY7AFcquNPV1I4pL+EN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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