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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4011f4752334e80250485c0d118edc6b0a8f6cdec97dbc929a1fef49196dbe11' 
  AND token = 'L5VggQTK9T/sgAY/jas1JJ5WEeO8uYKWotpg5QbumVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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