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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420e9c890bcd4ead1ede2facac1325e25d10ddf6e7da5e7aeabc306e809d52fb' 
  AND token = 'Et155QbTzz5gd4vFa6KmodOTAk9qjQ3IoPQPh79Q2CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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