SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945b3b558cc3c53f55ac3b542a422c6c64f8facdff195e3fb8d0a974f4920841' 
  AND token = 'CU7s8xg57lcP7hx7v9RAKl4Bi6/+XMpK+mtJGVAYdT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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