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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef5f9495df9f8ccfef14b5e1d5eee43f4d5246f2591a8d9893577dd0c76213b' 
  AND token = 'EvfsrkSRXECEH+6UH4CEsdVVHx6t+T0dWGw+zMaB3Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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