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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b314dfed50db375f7f543d6f7ba1cd1172ba6dcd554e7d9efd11b061cb77d4' 
  AND token = 'C5X88X7fY4VwyZzGE3BDydNsuJXO4WttEqZI7ZP3eAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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