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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b777c60355cd6e9b551a9a0a4a71874e6eb6df79147a6e5f7010630ce0128db1' 
  AND token = 'jgtBvuR49vqmknuuVuSBi5ukWe0DIObu4iju+7ZX8as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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