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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00dc9eab48cd648e0fbf2039e30c5df8df39da4c69d2dd6212460b2545ade54' 
  AND token = 'OVpcfFILU1q5EFMw0TaOGMdYETLM6pkRzIaguFtg0rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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