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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14626f6253689cc02d63a606bb9cb6ca627227eebf3d62d15c1d8909d243e8a1' 
  AND token = 'iWGwwc9SUhPLYioIN2Jb7eXaAoTEx0KhLX7xuoPiYjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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