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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ef91888580b78f850d416b8bee2f0d7475adc640901dbc95adec8ed5b044b5' 
  AND token = 'x11DLzyUy+ggWfKR24CbL/Bullf1FM+U5+VcSa8yBrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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