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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d9dd9eebd217447a0fa4b71fdaa9f7df65246ba493cedde74dfdec904acc97b' 
  AND token = 'bnwP7weHh0t+Q9/qnumcZbKzORa6mh0Rfq6SHMtZZ10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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