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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36454773cd5354088628093a7bec7816b9a444d888955b9192d2f7a15883a20' 
  AND token = 'lsD02UY3A1ZE2Fktx1UE2ZEkZjPTx7zZi0ETUtl/ImY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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