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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea9b7882c8cf5f16d3098730fdac3ca2496f191cfb5c01333340fbf63ad914b' 
  AND token = 'U7LwL751+xIMIt9nhi0Rc2WieRkd67NmLRLxMJcko5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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