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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9db7158fd67684811d30df28f79aa6acc3ce370359c66b4651e9d046b35a79' 
  AND token = '3sSVmSD9YBm3GPX/AkG0DUTpO8eYSeQFWoUDDpa2DyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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