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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1755146f925b7454e822aa0102b97893dabec1edef9c369c003b86e80fd1d1' 
  AND token = 'UHhQq74bqNY11tyBfjC2QwBntRXO+rtQivM3H2ZgTiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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