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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b808b3625f768fbe8eea308505d1bd46358cb1a62df9f09740b0d0b05de6c2e7' 
  AND token = 'Cxs+9ooIwsCaFNb8PX1umbmQk15uUdf1j6k+Ch5MQME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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