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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098f1eff428ebdbad555bd06ea3d5c77a192765ef7ee5b18897c574fbe76a2c4' 
  AND token = 'cpVU0oGFpcdX3/7KCaL6aBxWjPny+JZcRp9a33rKMdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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