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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a249fd18247bad39adb7c6703fd2bd057d1ed2700359b666b939be54512a6b8a' 
  AND token = 'dbeml7jA7RQ40QCQpqNV5OoViaM6Zi0M+2szLo+tUOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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