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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc91fbb5cd17700d0ac4919ef87ee8b26067bbc1e80aa151a7ce9f99f75969a3' 
  AND token = 'MN5mUuKuBb1uJM5QV7LxTQDlGZ0ZkvdbBWNGCZw8TGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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