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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eddae055c00d839ec481ab946f761a80b19a6dfd9dda21806c26645682aab7a' 
  AND token = 'dCEfnh3pkHcp0RQDC5XDqvSoLCKLwQqQpQ8S1XrWoa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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