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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c86ee2272548fcbb2f04a8af029c3e8f1ec671560140f712a8b6434e1eeea20' 
  AND token = 'eqBrvcKumiahNNvgtfmV1IJr1oUqo/fhaxug8nabwVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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