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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4ad2aa4b70ff8991df8cabf750080b127870fc37aec9b051ac78e49507b009' 
  AND token = 'QrrlMBJtpXT7w7nR8NzpTIDS8jh5Tl48WacWSdo3Aus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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