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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d3648f4a5f6a9c45b25b26056244152fd40e251fff93a56694c1297fef52fd' 
  AND token = 'n0pCpZ8D2Yd7bstQzdDbRkZ5t42pm1lZbGHs2dpkaa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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