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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6204bfde33c25390a010d735fabacfc37ec64d8f4ac0c93148dad145d5bc0519' 
  AND token = 'f44OLNxVLiiim13qDM8lL6O9cR80Niqapt2khQTYY7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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