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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f64605181e5faff0286460ce37a1b5c7de7a5106057bca4a333c047d4f18d13' 
  AND token = '5zxGIqlnXA1zASzcwIw3LwZW73S70aCDBNpr/BE2XIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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