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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc03286e47f2e81451d20eb939a2cdf1febd736cd82819ea2f0c70bc13f941a' 
  AND token = 'fwFkME9cTY3MicxkNKpw77IeopQpK4oeQPm3b4rby60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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