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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab3e424172be62b989c864fe046402b0ed58bc6faf0bf835d39632c0a9ce9c4' 
  AND token = '37vNO5pfLLHsFQfTKUKvMFAkUq4TWCupiNCOsHfS+h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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