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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107bf8488e08a949e2f83632ba217428306c3eee364cc18677f1c86b1703b696' 
  AND token = 'nQPR7sySXyM/+ttBJxT7Tw7TlMyabturedS8fcmUOhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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