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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a0e998cc05e823be15e00b619921509add54fce0bc6b7b5b660cc8e3f907cc' 
  AND token = 'xBRLYAeKGAgve9hTSGfJirQjTAPr+h9PqLsM2cxh+TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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