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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c091ced658944f39067ed644f34fd34867c79955473040ac1e0c1face756e98b' 
  AND token = 'hFpGsZ7Wch63DxcQMFk6uQg0AxTW3A4g8Y0HGfhIg0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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