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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa375ee58ab98c47267ed0a5c62dcc57a060b03581e55aa28708e413e77d32c' 
  AND token = '+3tkR7reaAQ1xl22Kg4Z9NV6sjz8M1qmaZ+AH+/h6SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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