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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2db1bdfafbf433831a9054a7f46ff8fd7c2361191203e9c57a41cd57b8ed90' 
  AND token = 'V1EgYoCNumbr8aismmqo52/PUqwt0PPchZexY4y1j3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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