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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9dd046aa0e642afa67c7c59e7ad863b53f7abaf0ed5e96f1656bccb4253f27' 
  AND token = 'UruDGQw9o2vEAYUJVbaAMJy4hchpN5JeKheVG0cO430=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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