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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485fd6c93cf81ddd8567a9937f92281028e3170d791390cb7cd1b531ecd29e22' 
  AND token = '6jXrggcYgXDB8Xff1D55UwrW5ovduu6PLEnOtWcfsTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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