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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182fdedbcbfcbd12e80727c07bd182283a82cdc1cae19f89d817f269ac0e511c' 
  AND token = 'bAkC+ip1mhPdeF07nHlf1DdWrT3Nn1MySeGc3k0QGIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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