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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1feade6448a6051429e9fee197d4ac1cb8a2a83819a2fae50c7e389630934456' 
  AND token = 'xyRJRbkNIPR/NoU4bsKnugYhtzxZqKXOUZPPo7EKazw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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