SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b9a80b2419a5b5521be23c3e748706b3a943e83e10216d376f0b5d66e48375' 
  AND token = 'Q9Ddy9W4CXFaEKpYaXTjQJ0gyjWeYV5G5GhqgvdFFmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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