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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65f86dd9773014232d532373b7d199dff5325d9e55b0c47d5ec48783bed27fd' 
  AND token = 'ufe3cT62H+2JObXX7UFzL72nV994AjzucdC8tMMUHN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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